SU692799A1 - Cellular concrete mixture - Google Patents

Description

(54) CELL CONCRETE MIXTURE

one

The invention relates to building materials compositions, in part, of cellular non-autoclave heat insulating concretes and can be used in the construction and building materials industry.

A well-known concrete mixture comprising portland cement, fine ground sand, aluminum powder, caustic soda, carboxyl methyl cellulose and water 1. . :

This composition does not contribute to a decrease in water absorption, capillary suction, sorption moisture, and carboxyl methylcellulose is a deficient material.

Closest to the present invention is a concrete mixture, which includes mineral sticking, gasifier, additive and water 2

This composition, which has the above-mentioned disadvantages, does not provide an intensive process of expansion, stabilization of the resulting macrostructure, does not shorten the time before cutting the composite concrete mass, and has low physicomechanical characteristics.

The purpose of the invention is to reduce the amount of water absorption in the capillary suction, sorption moisture and heat conductivity coefficient, as well as increase the compressive strength.

The goal is achieved by the fact that the concrete mixture, including mineral sticking, gasifier, additive and water, contains caustic soda, montmorillonite bentonite and hydrophobic compound as an additive in the following ratio of components, wt.%: .

Mineral in a gut 52 - 55 Gasifier 0,10-0,11 Caustic soda 0,10-0,35

Montmorillonite

betonite 0.30-0.50

Hydrophobic compound 0.10-0.35 Water Else

As a hydrophobic compound, it contains paraffin, ethyl hydrosiloxane liquid or sodium methyl silicate.

The constituent components of the additive are introduced into the concrete mixture in the following sequence: montmorillonite bentonite, together with the mortar; caustic soda and water-soluble additives (methyl methane sodium silicate) together with water and ethyl hydrosiloxane liquid in the form of an aqueous emulsion. In this case, water is reduced by the amount used to prepare the emulsions.

The application of the proposed additive, intended for forming large arrays, with a volume of 6oJiee 10 m and a height of more than 100 cm, provides intensive swelling in 7-10 minutes; stabilization of the resulting macrostructure and obtaining a structural strength of 0.2-0.20, 3 kgf / cm using the Valdre plastometer, which is sufficient for defect-free cutting after 40-90 minutes from the start of forming. Draft mass does not exceed 2 mm. When using the additive complex, a two-pore distribution of pores with their most common sizes of 0.143 and 0.572 mm was achieved, which contributes to an increase in the strength of aerated concrete hardening in the massif after 28 days to 16 kgf / cm. The amount of water absorption, sorption moisture, capillary suction decreases 2.02, 5 times.

Caustic soda acts as an intensifier of the swelling process. A characteristic feature of montmorillonite clays is that they are highly susceptible to thixotropy, i.e. the formation in water suspensions of even small concentrations of a fairly stable gel. This ability is particularly pronounced in the presence of a builder, an alkali, in this case caustic soda. In combination with caustic soda montmorillonite. bentonite appears as a powerful stabilizer

Structural strength after 4090 min from the beginning, molding, kGS / cm 0,25

Grade of concrete at the age of 28 days, kgf / cm

Water absorption, mass. %

Capillary suction, wt.%

formed macrostructure. The introduction of hydrophobic additives contributes to the improvement of the water-protective properties of aerated concrete and the thermophysical characteristics of concrete.

Example 1. Preparing a concrete mix in the following ratio of components, wt.%;

Spampportlandcement 55.00 Aluminum powder - 0.10 Mdntmorillonite bentonite. 0.30 Paraffin 0.35 Water; 4.4.25 Example 2, Preparing a concrete mix with the following ratio of components, wt.%:

Slag Portland cement 52.00 Aluminum powder 0.11 Caustic soda 0.10

Montmorillonite bentonite 0.45 GKZH-11 0.10 Water 47.24 Example 3. A concrete mix is prepared with the following ratio of components, weight,%:

Slag Portland cement 53.50 Aluminum powder 0.10 Caustic soda, 20

Montmorillonite bentonite 0.50 GKZH-940.20. Water 45.5

The properties of cellular concrete and carbon concrete mixtures are summarized in the table.

Due to the listed properties, this cellular concrete mixture will significantly increase the mechanical and thermal insulation properties of building structures.

Table

0.12

0.30 0.26

Sorption moistening at 100%, wt.%

Thermal conductivity coefficient

 kcal,

h.grad

dry samples

at maximum

sorption

moisturizing

Claims (2)

1. Aerated concrete mixture comprising a mineral sticking gasifier, an additive and water, characterized in that, in order to reduce the water absorption of the capillary suction, sorption moisture and thermal conductivity, as well as increase the compressive strength, it contains additives caustic soda, montmorillonite, a new bentonite and a hydrophobic compound in the following ratio of components, weight,%: Mineral to gash: 52-55 Gasifier 0.10-0.11 Caustic soda 6.10-0.35 Continued tally1 (s 26.0 11,015.0 9.0 0,090 0,094 0,078 0.108 0.108 0.111 0.085 0.140 Moitmorillonite bentonite; 0.30-0.50 five Hydrophobic compound0, 10-0.35 Water Else 2. Aerated concrete mixture according to claim 1, characterized in that, as a hydrophobic compound, it contains paraffin, ethylhydrosiloxane liquid or sodium methylsilyconate. five Sources of information taken into account in the examination 1. Author's certificate of the USSR, 481564, cl. From 04 To 13/22, 1975. 2. USSR author's certificate 0 No. 478803, cl. From 04 V. 15/06, 1975.